Submitted Abstract on November 02, 11:58 PM
for MRS Spring 2005 Abstract Proof
CONTROL ID: 128333
CONTACT (NAME ONLY): Shigeo Maruyama Abstract Details
PRESENTATION TYPE: Invited Speaker
SYMPOSIUM: U: Science and Applications of Carbon Nanotubes
KEYWORDS: Single-Walled Carbon Nanotubes, Vertically Aligned, CVD Growth.
Abstract TITLE:
ACCVD Growth of Vertically Aligned Single-Walled Carbon Nanotubes on a Quartz Substrate AUTHORS (ALL): Maruyama, Shigeo 1.
INSTITUTIONS (ALL): 1. Dept. of Mech. Eng., The University of Tokyo, Tokyo, Japan.
ABSTRACT BODY:
Vertically aligned single-walled carbon nanotubes (SWNTs) up to 5 microns thick were produced by an alcohol CVD process [1]. In contrast to the first report of CVD growth of vertically aligned SWNTs [2], hydrogen gas was supplied only during the heating-up stage with the improved background vacuum condition. A time-progressive investigation of the growth process was studied by observing SEM images of SWNT films grown for different CVD times. Measurements of the film thickness by both SEM and optical absorbance show a non- linear growth rate, as well as an eventual decrease in the film thickness after extended reaction times. This is attributed to the presence of oxygen in the reaction chamber, which decreases catalyst activity as well as oxidizes the nanotube film. By using the relation between light absorbance and the thickness determined by SEM, the in situ monitoring of the vertically aligned SWNT film thickness has made possible for the further investigation of the growth mechanism.
Polarization dependence of resonant Raman scatterings from vertically aligned SWNT films and polarized optical absorption properties of SWNTs are studied by using these samples.
References
[1] S. Maruyama, R. Kojima, Y. Miyauchi, S. Chiashi and M. Kohno, "Low-Temperature Synthesis of High-Purity Single-Walled Carbon Nanotubes from Alcohol," Chem. Phys. Lett., (2002), vol. 360, no. 3-4, pp. 229-234.
[2] Y. Murakami, S. Chiashi, Y. Miyauchi, M. Hu, M. Ogura, T. Okubo, S. Maruyama, "Growth of vertically aligned single-walled carbon nanotube films on quartz substrates and their optical anisotropy," Chem. Phys. Lett., (2004), vol. 385, no. 3-4, pp. 298-303.
[3] Y. Murakami, S. Chiashi, E. Einarsson and S. Maruyama, "Polarization dependence of resonant Raman scatterings from vertically aligned SWNT films," submitted to Phys. Rev. B.
[4] Y. Murakami, E. Einarsson, T. Edamura and S. Maruyama, "Polarized Optical Absorption Properties of Single-Walled Carbon Nanotubes," submitted to Phys. Rev. Lett.
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